Thanks to iphoneatlas, here are some interesting bonuses that came bundled in the iPhone 2.2 update:

‘Update All’ back The ability to update all applications with the press of one button-a feature that was disable in iPhone OS 2.1-is back in iPhone OS 2.2.

Locked screen screenshots iPhone OS 2.2 now offers the ability to snap images of the locked screen. To take a screenshot: while holding the home button, press and release the sleep/wake button. A screen flash indicates that that the image was captured.